Since ribosomes are found in bacterial cells, do ribosomes have a membrane around them? why or why not?

No. Ribosomes do not have a membrane. They are composed of 2 subunits - the small subunit is where the mRNA is read and the large subunit is where the amino acids are joined together to form the polypeptide (protein) - a membrane would interfere with this process. Plus, ribosomes are in both eukaryotes and prokaryotes - and prokaryotes have NO membrane bound organelles.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

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foliated

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foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

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